So in order to help players who've forgotten - or never did them in the first place - I decided to collect some information about various keys and attunements in one place so you don't need to trawl through multiple sites.

1) SCARLET KEY-required for SM Armory and Cathedral

-after killing Arcanist Doan in SM Library, the key is lootable from a chest by every party member

2) SCHOLOMANCE KEY-required to enter Scholo but can be bypassed by a rogue with high enough lockpicking

You will need the following mats during the chain, which you should get beforehand:2x Thorium Bar

3) SEAL OF ASCENSION-required to enter Upper Blackrock Spire

-collect 3 gems and unadorned Seal of Ascension from LBRS. The last one drops randomly from all mobs, the gems drop from Wyrmthalak/Omokk/Voone. You can have all 4 in your inventory without getting the quest first. The NPC is inside LBRS, hidden in a cave.http://db.vanillagaming.org/?quest=4742-second part is to mind control Emberstrife, a level 60 elite wyrm, to breath the Flame of the Black Dragonflight, on the quest item.http://db.vanillagaming.org/?quest=4743

4) KEY TO THE CITY-required to enter the Scourge side of Stratholme, making Baron runs easier, though the doors can be lockpicked

-drops off Magistrate Barthilas

5) WORKSHOP KEY-backdoor to Gnomeregan that allows party to skip most of the instance to reach the emissary (rare) and the final boss quicker

-once you reach revered with them, you should be able to get Eternal Quintessence but this was introduced in patch 1.11 so whether it exists on Nostalrius yet is unknown. Please share your knowledge if you have already grinded the reputation!

-get Sacred Mallet from Qiaga the Keeper in Hinterlands and take it to the nearby altar

11) SHADOWFORGE KEY-required to skip parts of BRD and to enter the Grim Guzzler bar instead of having to have rogue pick the locks.

-started by a quest that you can only get in ghost form, outside of the instance. So once you're in BRD, keep your eyes open as you run back after your first wipe.

12) CRESCENT KEY-required for Dire Maul North and West parts

-drops from Pusillin in DM East

13) DRAKKISATH'S BRAND-required to enter Blackwing Lair

-started by getting a quest item off Scarshield Quartermaster near the entrance to Blackrock Spire and requires a UBRS raid

14) SCEPTER OF CELEBRAS-teleports you to the last segment of Maraudon for quicker Princess runs

-starts with http://db.vanillagaming.org/?quest=7044 from an NPC in Desolace and requires you to kill Noxion in orange part and Vyletongue in purple part, then talk to Celebras the Redeemed after defeating him.

-note that this quest was bugged at launch but has since been fixed so if you skipped back in the day, you should go back to Maraudon and complete it now

***No point in adding AQ War Effort or Naxx attunement at this point***

If I've missed anything important or you feel that there should be additional details, let me know.

Last edited by Garfunkel on Wed Dec 02, 2015 6:00 pm, edited 2 times in total.

-once you reach revered with them, you should be able to get Eternal Quintessence but this was introduced in patch 1.11 so whether it exists on Nostalrius yet is unknown. Please share your knowledge if you have already grinded the reputation!

can confirm Eternal Quintessence is not obtainable yet. At Revered, Duke Hydraxis still provides the Aqual Quintessence.